KR100714084B1 - Oil-based metal working fluid and metal processing method using the same - Google Patents

Abstract

The present invention relates to a metal co-coating agent and a metal processing method using the same, at least one lubricant base oil having a flash point of 50 to 200 ℃, distillation range of 150 to 350 ℃, kinematic viscosity (40 ℃, cSt) 1 to 8, and ester It provides a metal co-coating agent, characterized in that it comprises at least one lubricant improver selected from the group consisting of alcohols, alcohols and hydrocarbons. Metal working oil according to the present invention can be greatly contributed to improving the productivity of the process because it is possible to remove the residue of the emulsion only by the drying process without washing process is excellent in the drying and lubricity of the emulsion residue.

Description

Oil-based metal working fluid and metal processing method using the same

1 is a process chart showing a general heat exchanger assembly process,

2 is a block diagram of a process for manufacturing a heat exchanger by a vacuum brazing method using a conventional metal-coating agent,

3 is a block diagram of a process of manufacturing a heat exchanger by a flux brazing method using a conventional metal working oil,

4 is a block diagram of a process of manufacturing a heat exchanger by a vacuum brazing method using a metal working oil according to the present invention;

5 is a block diagram of a process for manufacturing a heat exchanger by a flux brazing method using a metal working oil according to the present invention.

The present invention relates to a metal co-coating agent and a metal processing method using the same developed to improve the productivity of the entire process by improving or omitting some processes when processing the metal material.                         

Metal processing can be divided into cutting, grinding, cutting and grinding of metal materials, and plastic processing, which deforms only the shape while maintaining the initial volume and mass of the material. According to this processing method, the oil applied to the process is classified into cutting, grinding oil, and plastic working. The two oils are collectively called metal working. However, in the actual metal processing process, the above two processing methods are not performed independently, but in most cases, two processing methods are simultaneously performed in one process.

In the processing of metal, a large amount of heat is generated by friction of materials and tools. The generation of heat can be explained physically by the principle of friction force and friction heat.

When two surfaces are physically moved in contact with each other in the opposite direction, a friction force is generated, and the friction force generates friction heat. That is, the total energy required to move the two surfaces is made up of the sum of the frictional force between the two surfaces and the energy required for the actual movement of the two surfaces, and the energy consumed by the frictional force is dissipated to the surroundings in the form of frictional heat. In terms of energy efficiency, that is, economics, inefficient energy consumption occurs because additional energy must be supplied in addition to the energy required.

Applying this aspect to the processing of metal, the metal material and the tool of the metal processing are the same as the two surfaces moving in opposite directions, and the heat generated during the processing of the metal becomes frictional heat generated by the frictional force. At this time, the generated frictional heat is dissipated to the surroundings, so it is like leaking some of the given energy to the outside. Therefore, it can be concluded that the metal material can be processed only by supplying more energy than the energy required to process the actual metal material.

To improve this inefficient use of energy, the friction between the two surfaces must be reduced. If a material is introduced that can reduce friction on both surfaces, the amount of energy required to move the two surfaces will be reduced. The energy inefficiency is reduced and economic benefits can be obtained.

The ability to reduce the frictional force is called lubricity and the material with such lubricity is called lubricant.

Generally, lubricants can be broadly classified into solid lubricants and liquid lubricants.

Solid lubricants are solid in their properties, and the most representative ones are Bondite, lime soda, and the like. Solid lubricants have the advantage of having very high lubricity, but since their properties are solid, deterioration of the working environment is caused by dust, etc., and it is difficult to uniformly introduce lubricant into the material.

Liquid lubricant is a form in which mineral oil, fatty oil and other synthetic oils and other necessary components are added, the lubricity is slightly inferior to the solid lubricant, but has an advantage in terms of ease of use. Such liquid lubricants are generally referred to as metal covalent agents.

That is, the metal-coating agent generally refers to a form in which other necessary components are added to lubricating base oils such as mineral oil, fatty oil and other synthetic oils. Initially only lubricating base oils such as pure mineral oil or fatty oil without any additives were used. However, due to industrialization, the development of material processing technology, the complexity of the required shape of the material, and the severity of work processes made it impossible to process metals using only lubricating base oils such as pure mineral oil and fatty oil. The additive of was applied.

The types of additives are classified by the function of the additives, and may be classified into lubrication enhancers, extreme pressure agents, antirust additives, antioxidants, and the like.

The composition of the metal-coating agent changes according to the characteristics of the material to be processed, the processing method, and the difficulty of the processing process. When the hardness of the material is high and the process difficulty is high, the content of the lubrication enhancer and the extreme pressure additive in the additive increases proportionally. In general, the metal covalent additives applied to the processing of iron-based metals have higher extreme pressure than metal covalent additives applied to the processing of nonferrous metals, that is, aluminum and copper. This is because the hardness of the iron-based metal is higher than that of the non-ferrous metal, thereby increasing the difficulty of operation.

Even after processing the material, the metal co-coating agent applied during the processing remains on the surface of the material, and when the material is processed in the next process with the remaining oil, there is a very big problem. As a representative example, in the case of vacuum brazing using a vacuum furnace or flux brazing using a flux, residual emulsion must be removed. When heating a material processed with a metal-coating agent in a post-process, the emulsion remaining on the surface of the product generates carbides. This is because the problem that the molding is not made and the appearance defects are caused to reduce the quality of the product. In order to solve this problem, a washing process for removing the oil remaining in the material is generally performed.                         

As an example of the washing process according to the metal working process will be described in more detail with reference to the heat exchanger manufacturing process. In general, the heat exchanger manufacturing process consists of a series of processes as shown in FIG. Although the process shown in FIG. 1 shows the manufacturing process of an evaporator, the washing process mentioned above is applied also to the manufacturing process of heat exchangers, such as a heater core.

Referring to the evaporator manufacturing process of FIG. 1 as an example, the tray 901 is a pin plate assembly 21 in which a pin 11 manufactured through a roll mill molding process and a plate 12 manufactured by press molding are assembled together. To feed. Next, the special plate assembly 22, the end plate assembly 23, and the manifold assembly 24 are sequentially mounted on the tray 901 to complete the heat exchanger assembly 25. The heat exchanger assembly 25 is subjected to a cleaning process that is used in forming the fins and plates before being taken out of the tray and subjected to subsequent brazing processes to clean the metalworking oil remaining on the fins and plates.

The fin 11 used in the heat exchanger assembly is manufactured by passing through a sheet of fin-forming material through a roll mill having irregularities formed on the outer circumference thereof and then cutting it. In roll mill forming, significant friction forces are generated by the friction forces generated as the two surfaces of the roll mill and the sheet move in opposite directions. These friction forces and frictional heat are undesirable because they not only cause mechanical wear of the roll mill but also involve energy losses. Therefore, metal processing oils such as quick-drying oils and general oils are used in pin forming for the purpose of reducing such friction. In general, in the case of general oil, oil remains on the fin before the fin is assembled into the heat exchanger assembly and undergoes the washing process, and there is a problem that the fin must be washed to clean the oil.

On the other hand, the plate is manufactured by a press molding process, the punch used for press molding also uses a processing oil because there is a high risk of damage due to mechanical friction and impact. However, since the hardness of the plate material to be press-molded and the processing conditions are more severe, there is a limitation in applying the conventional quick-drying oil. Therefore, there is a problem in the plate-molded plate must be subjected to a washing process because a larger amount of processing oil remains than in the case of a pin formed by using a quick-drying oil.

The cleaning agent applied to the washing process can be largely divided into a solvent type cleaner and a water soluble cleaner.

Solvent-type cleaning agents can be classified into petroleum solvents and chlorine-based solvents, and has the advantages of excellent washability and dryness. However, the disadvantage is that petroleum solvents have excellent drying properties and have a high risk of fire and human health. In particular, in the case of chlorine-based solvents are very harmful to the human body, the situation is limited to apply worldwide. The application of such solvent-type cleaners requires the installation of a special device such as a ventilation device and a human body protection device, resulting in an increase in manufacturing cost.

Aqueous detergents can be divided into degreaser and surfactant forms. Water-soluble detergents are water-based additives, so the hazards to the human body is lower than that of the solvent type, but has the disadvantage of poor washability.                         

Therefore, at the present time, when a precise cleaning is required, most solvent type cleaning agents are applied, and when there is no protective equipment for the human body, water-soluble cleaning agents are used.

The above washing process requires a lot of expenses such as the application of the cleaning agent, the treatment of contaminants and the introduction of special equipment in the process, and thus has an economic disadvantage of an increase in manufacturing cost. Therefore, if the cleaning process can be omitted, it can contribute a lot to the cost reduction of the manufacturer.

As a method of omitting such a washing process, it is most economically efficient to completely evaporate the residual emulsion by a simple drying process after processing the material. However, the processing oil applying general mineral oil as a lubricating base oil is completely removed only by heating to a very high temperature, that is, about 600 ° C. or more, which is performed not by evaporation but by thermal decomposition of the mineral oil into gaseous forms of carbon dioxide and water vapor.

However, when a material having a low melting point such as aluminum (melting point about 700 ° C.) is treated at a high temperature of 600 ° C. or higher, the surface of the material is easily oxidized and the shape of the material may be easily deformed. In addition, maintaining the temperature by heating above about 600 ℃ consumes a lot of energy, so it is not economically desirable.

Therefore, efforts have been made in the industry to develop processing oils (eg, fast-drying oils) that can be simply removed by a drying process without going through a washing process or a pyrolysis process. However, the excessively high evaporation of the metal-coating agent is not desirable in terms of danger to humans, and also in the possibility of causing damage to the unit due to the high possibility of the oil being evaporated and lubricating at all during operation. . In particular, it is not easy to develop a fast-drying metalworking emulsion having both sufficient lubricity and evaporability to be applicable to the press forming process of heat exchanger parts. In addition, if the evaporation is not high enough, the residual oil will cause carbides to be produced during subsequent processing, such as brazing, which will greatly reduce the quality of the product.

Accordingly, the technical problem to be achieved by the present invention is to provide a metal co-coating agent that can provide sufficient lubricity during processing such as pin molding and press molding while remaining oil can be completely evaporated by a drying process without a separate washing process.

The present invention to achieve the above technical problem,

At least one lubricant base oil having a flash point of 50 to 200 ° C., a distillation range of 150 to 350 ° C. and a kinematic viscosity (40 ° C., cSt) of 1 to 8, and at least one member selected from the group consisting of esters, alcohols and hydrocarbons. It provides a metal co-sharing agent comprising a lubrication enhancer.

According to a preferred embodiment of the present invention, the content of the lubricant improver may be 20% by weight or less based on the total weight.

According to a preferred embodiment of the present invention, the lubricating base oil may be at least one selected from the group consisting of petroleum, mineral oil and synthetic lubricating oil.                     

According to a preferred embodiment of the present invention, the lubricating base oil may be a petroleum base oil having a distillation range of 250 ° C. or less, a petroleum base oil having a distillation range of 350 ° C. or less, or a mixture thereof.

According to a preferred embodiment of the present invention, the ester-based lubrication enhancer is one or more selected from the group consisting of vegetable, animal and synthetic esters, carbon number 11-60, acid value (mg KOH / g) 2.0 or less, saponification value (mg KOH / g) 50 to 300, the flash point may be 300 ° C or less.

According to a preferred embodiment of the present invention, the ester-based lubrication enhancer may be represented by the following general formula.

RCOOR '

In the above formula, R is an alkyl substituent having 10 to 30 carbon atoms, and R 'is an alkyl substituent having 1 to 30 carbon atoms.

According to a preferred embodiment of the present invention, the alcohol-based lubrication improver is at least one selected from the group consisting of alcohols and synthetic alcohols extracted from vegetable and animal fats and oils, and includes an alkyl substituent having 10 to 24 carbon atoms, the acid value (mg KOH / g) 1.0 or less, saponification value (mg KOH / g) 5 or less, flash point (° C.) may be 300 or less.

According to a preferred embodiment of the present invention, the hydrocarbon-based lubricant improver may be at least one selected from the group consisting of mineral oil-based hydrocarbons and synthetic hydrocarbons obtained by refining petroleum.

The present invention also provides a metal working method comprising the step of forming a metal material by cutting, grinding or plastic working to have a predetermined shape, wherein the metal co-coating agent according to the present invention is applied to the surface of the metal material in the forming step, Emulsion remaining on the metal surface after the molding process provides a metal processing method characterized in that the removal only by the drying process without a separate washing process.

Hereinafter, the present invention will be described in more detail.

The present invention uses a suitable lubricant base oil and a lubricating agent as a metal working oil which can provide sufficient lubricity while efficiently removing residual oil from a variety of lubricating base oils in circulation. It is a basic feature.

According to the researches of the present inventors, it has been found that such a lube base oil has the following characteristics.

 * Kinematic viscosity (40 ℃, cSt): 1 to 8

 Flash point: 50-200 ℃

 * Distillation range: 150 ~ 350 ℃

If the kinematic viscosity exceeds 10, the flash point exceeds 200 ° C, or the distillation range exceeds 350 ° C, it is not preferable because it may not be sufficiently removed by the drying process alone, and there is a risk of producing a residue under dry conditions. In addition, if the kinematic viscosity is less than 1, the flash point is less than 50 ℃ or the distillation range is less than 150 ℃ is not preferable because the lubricity is insufficient.

Lubricant base oils used in the metal co-coating agent according to the present invention may be used only by one type or by mixing two or more types that satisfy the above characteristics.

The metal co-coating agent according to the present invention uses a lubrication improving agent for improving lubricity, and the type of lubrication improving agent that can be used in the present invention may be classified into ester, alcohol and hydrocarbon. In general, fatty oils or synthetic ester compounds are used the most, but it is also preferable to use alcohol-based and hydrocarbon-based lubrication enhancers that do not produce carbide when dried.

In the ester compound, a carboxyl group, which is a polar substituent on its structure, is adsorbed on a metal to exhibit lubricity. The most commonly used ester compounds are animal or vegetable fatty oils such as lard, beef tallow and rapeseed oil.

In recent years, synthetic esters have been produced. Some of these synthetic esters are characterized by being able to be dried to a certain degree while providing lubricity and hardly generating carbides at high temperatures.

As described above, there are various kinds of ester compounds applied as lubrication enhancers, but the kind of esters that satisfy the actual drying conditions is limited. In general, low molecular weight esters have excellent drying properties but lack of lubricity, and high molecular weight esters have excellent lubricity but have poor drying properties.

The ester-based lubricant improver used in the present invention has the following characteristics.

In general, esters having high carbon number or three or more carboxyl substituents have excellent lubricity, but have residues when dried and carbides are produced when the drying temperature is high. In the present invention, in order to minimize the generation of residues during drying and to improve the lubricity of the metal working emulsion, an ester having the following properties was applied.

Carbon number: 11-60

* Acid value (mg KOH / g): 2.0 or less

* Saponification value (mg KOH / g): 50 ~ 300

Flash point (℃): 300 or less

The ester having less than 11 carbon atoms is difficult to apply because of lack of lubricity, and if the carbon number exceeds 60, it is not preferable because the lubricity is excellent but lacks dryness. If the total acid value is more than 2, it is a result of excessive residual unreacted organic acid in the ester, and thus there is a risk of generating residue by unreacted organic acid. In addition, if the saponification value is less than 50, the lubricity is insufficient, and if it exceeds 300, there is a high risk of generating a residue.

More specifically, the ester-based lubricant is preferably represented by the following general formula.

RCOOR '

In the above formula, R is an alkyl substituent having 10 to 30 carbon atoms, and R 'is an alkyl substituent having 1 to 30 carbon atoms.

Alcohol-based lubrication improvers generally have a lower lubricity than ester-based lubrication enhancers. It is assumed that this is because the degree of adsorption to the metal surface is lower than that of the ester system. However, alcohol-based lubrication enhancers have the advantage of low or no residues generated at high temperature drying, and in particular, xanthan ash and ash are not produced during the annealing process.

Specifically, alcohol having a low carbon number has a low flash point and lacks lubricity and thus cannot be applied as a lubrication enhancer for metal working oils. Alcohols having a high carbon number have excellent lubricity but have a high risk of generating residues upon drying. Therefore, in the present invention, in order to minimize the generation of residues during drying and to improve the lubricity of the metal co-coating agent, an alcohol-based lubrication improving agent having the following properties was applied.

Carbon number: 10 to 24

* Acid value (mg KOH / g): 1.0 or less

* Saponification value (mg KOH / g): 5 or less

Flash point (℃): 300 or less

Alcohol having less than 10 carbon atoms is difficult to apply because of lack of lubricity, and if the carbon number exceeds 24, the lubricity is excellent, but it is not preferable because of lack of dryness. If the total acid value is more than 1, the organic acid as an impurity remains in the alcohol, so there is a risk that residues caused by impurities are generated. In addition, when the saponification value exceeds 5, it means that impurities are present in excess, so that there is a high risk of generating residues.

Hydrocarbon-based lubrication enhancers are applied to high molecular weight hydrocarbons and polymeric hydrocarbon compounds such as poly (alpha-olefin) (hereinafter referred to as PAO). Xanthan and ash are not generated during the annealing process and there is no odor.

Lubrication enhancers should be dried under the same drying conditions as for lubricating base oils. In particular, the adsorption to metals is higher than that of lubricating base oils, so care should be taken in the amount used. Therefore, in the present invention, when the lubrication enhancer is added, its amount is limited to 20% by weight or less. If the content of the lubrication enhancer exceeds 20% by weight, it is not preferable because it is likely to produce a residue.

In addition to the lubrication enhancer described above, the metal-coating agent according to the present invention may contain discoloration inhibitors, extreme pressure agents, antirust additives, antioxidants, and the like.

Generally, the metal working fluids lubricated between the material and the tool are subjected to high heat and pressure. These heat and pressures risk the discoloration of some of the metalworking agent components on the metal surface. Discoloration inhibitors are added to prevent discoloration of these metal surfaces. Specific examples include methylbenzotriazole and its derivatives.

The extreme pressure agent is not particularly limited in kind, and known extreme pressure agents used in the art may be used. Specific examples include sulfide-based extreme pressure agents such as sulfurized fatty oils and sulfide olefins, phosphorus compound-based extreme pressure agents such as phosphate esters and phosphate ester amine salts, and chlorine compound-based extreme pressure agents.

There is no restriction | limiting in particular in the kind about antirust additive, The well-known antirust additive used in the art can be used. Specific examples thereof include metal sulfonate salts, metal fatty acid salts, metal phenates and thiazoles, azoles, and amines.

There is no restriction | limiting in particular in the kind as antioxidant, The well-known extreme pressure agent used in the art can be used. For example, there are phenol compounds such as 2,6-di-Tert-butyl paracresol, amine compounds such as phenyl-α-naphthylamine, sulfur compounds, and phosphorus compounds.

Hereinafter, the features of the present invention will be described in more detail with reference to examples of the present invention. The following examples are merely illustrative of the present invention and the scope of the present invention is not limited thereto.

The components of the composition used in the following examples are as follows.

Lubricant base oil

A: Petroleum lubricant base oil with distillation range of 150-200 ℃, flash point 56 ℃, kinematic viscosity (40 ℃, cSt) 1.4

B: petroleum lubricant base oil with distillation range of 200-300 ℃, flash point 100 ℃, kinematic viscosity (40 ℃, cSt) 2.4

C: Petroleum lubricant base oil with distillation range of 300-350 ℃, flash point 180 ℃, kinematic viscosity (40 ℃, cSt) 7.2

Lubrication Enhancer

D: RCOOR '(R is an alkyl substituent having 10 to 30 carbon atoms, R' is an alkyl substituent having 1 to 3 carbon atoms), and is an ester lubrication enhancer having a total acid value (mg KOH / g) of 0.5 or less and a gum value (mg KOH). / g) having a physical property of 150-250, a flash point of 250 ° C. or less, and a kinematic viscosity (40 ° C., cSt) of 2.5-6.0.

E: RCOOR '(R is an alkyl substituent having 10 to 30 or more carbon atoms, R' is an alkyl substituent having 4 to 6 carbon atoms), and an ester lubrication enhancer having a total acid value (mg KOH / g) of 0.5 or less and a gum (mg KOH). / g) is 100-200, the flash point is 250 ℃ or less, the kinematic viscosity (40 ℃, cSt) is a compound having a physical property of 4.0-13.0.

F: ROH (R is an alkyl substituent having 10 to 24 carbon atoms), an alcohol-based lubricating enhancer having a acid value (mg KOH / g) of 0.1 or less, saponification value (mg KOH / g) of 1 or less and a flash point of 300 ° C or less. Compounds with physical properties.

Discoloration inhibitor

G: Methylenebenzotriazole.

The properties of the metal working emulsion prepared in the following examples were evaluated as follows.

1) coefficient of friction

Measured by pendulum friction coefficient tester.

2) kinematic viscosity

The kinematic viscosity at 40 ° C was measured by the test method specified in KS M 2014, and the unit is cSt.

3) Computer Price

The computational value was determined by the test method specified in KS M 2004 and is in mg KOH / g.

4) Flash Point

Flash point was measured by the test method specified in KS M 2010 and is in ° C.

5) Distillation range

The distillation range was measured by the test method specified in KS M 0008 and the unit is ° C.

6) residue                     

After the metal working emulsion was placed in an aluminum sample cup and dried at 250 ° C. for 10 minutes, the weight of the residue was expressed as a percentage of the sample amount.

<Example 1-5>

To change the composition as shown in Table 1 to prepare a metal co-coating agent.

     Example composition One 2 3 4 5 A 98 weight% 95 weight% 92 weight% 85 weight% 80 wt% B - - - - - C - - - - - D 2 weight% 5 wt% 5 wt% 10% by weight  10% by weight E - - - - - F - - 3 weight% 5 wt% 9.5 weight% G - - - - 0.5 weight%

The coefficient of friction, flash point, distillation range, and residue characteristics of the metal covalently prepared as described above were measured by the above-described method, and are shown in Table 2.

       Example Test Item One 2 3 4 5 Coefficient of friction 0.20 or less 0.18 or less 0.17 or less 0.13 or less 0.13 or less Kinematic viscosity 1.4 1.4 1.5 1.6 1.7 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 70 or less 70 or less 70 or less 70 or less 70 or less Distillation range (℃) 240 or less 240 or less 240 or less 240 or less 240 or less Residue Less than 1% Less than 1% Less than 1% 2% less than 2% less than

According to the results of Table 2, as the content of the lubrication enhancer is increased, the frictional coefficient is lowered, but the kinematic viscosity is increased. It can be seen clearly.

<Example 6-10>

To prepare a metal co-coating agent of the composition shown in Table 3 below, the results of the property evaluation are shown in Table 4.

     Example composition 6 7 8 9 10 A 98 weight% 95 weight% 92 weight% 85 weight% 80 wt% B - - - - - C - - - - - D - - - - - E 2 weight% 5% by weight 5% by weight 10% by weight  10% by weight F - - 3 weight% 5% by weight 9.5 weight% G - - - - 0.5 weight%

       Example Test Item 6 7 8 9 10 Coefficient of friction 0.20 or less 0.18 or less 0.17 or less 0.13 or less 0.13 or less Kinematic viscosity 1.4 1.5 1.5 1.6 1.7 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 70 or less 70 or less 70 or less 70 or less 70 or less Distillation range (℃) 240 or less 240 or less 240 or less 240 or less 240 or less Residue Less than 1% Less than 1% Less than 1% 2% less than 2% less than

It can be seen from Table 4 that the metal co-sharing agent of Example 6-10 exhibited satisfactory properties including the acid value, flash point, and residue properties even when a lubrication enhancer (E) having a higher kinematic viscosity than the ester-based lubrication enhancer (D) was used. Can be.

<Example 11-15>

Table 6 shows the results of evaluating the properties after preparing the metal co-coating agent having the composition shown in Table 5 below.                     

      Example composition 11 12 13 14 15 A - - - - - B 98 weight% 96 weight% 93 weight% 85 weight% 80 wt% C - - - - - D 2 weight% 4 weight% 4 weight% 10% by weight  10% by weight E - - - - - F - - 3 weight% 5% by weight 9.5 weight% G - - - - 0.5 weight%

       Example Test Item 11 12 13 14 15 Coefficient of friction 0.19 or less 0.17 or less 0.17 or less 0.13 or less 0.13 or less Kinematic viscosity 2.4 2.5 2.6 2.7 2.7 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 120 or less 120 or less 120 or less 120 or less 120 or less Distillation range (℃) 330 or less 330 or less 330 or less 330 or less 330 or less Residue Less than 1% Less than 1% Less than 1% 2% less than 2% less than

From the above Table 6, all of the metal co-working agents of Examples 11-15, including kinematic viscosity, acid value, flash point and residue characteristics even when petroleum lubricant base oil (B) having a rather high distillation range instead of petroleum lubricant base oil (A) were used. It can be seen that the characteristics are also satisfactory.

<Example 16-20>

Table 8 shows the results of evaluating the properties after preparing the metal co-coating agent having the composition shown in Table 7 below.                     

     Example composition 16 17 18 19 20 A - - - - - B 98 weight% 96 weight% 93 weight% 85 weight% 80 wt% C - - - - - D - - - - - E 2 weight% 4 weight% 4 weight% 10% by weight  10% by weight F - - 3 weight% 5% by weight 9.5 weight% G - - - - 0.5 weight%

       Example Test Item 16 17 18 19 20 Coefficient of friction 0.19 or less 0.17 or less 0.17 or less 0.13 or less 0.13 or less Kinematic viscosity 2.4 2.5 2.6 2.7 2.8 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 120 or less 120 or less 120 or less 120 or less 120 or less Distillation range (℃) 330 or less 330 or less 330 or less 330 or less 330 or less Residue Less than 1% Less than 1% Less than 1% 2% less than 2% less than

It can be seen from Table 8 that the metal co-working agent of Example 16-20 exhibited satisfactory properties including the acid value, flash point and residue properties even when a lubrication enhancer (E) having a higher kinematic viscosity was used than the ester-based lubrication enhancer (D). Can be.

<Example 21-25>

To prepare a metal co-coating agent of the composition shown in Table 9 after the property evaluation results are shown in Table 10 below.                     

      Example composition 21 22 23 24 25 A - - - - - B - - - - - C 98 weight% 96 weight% 93 weight% 85 weight% 80 wt% D 2 weight% 4 weight% 4 weight% 10% by weight  10% by weight E - - - - - F - - 3 weight% 5% by weight 9.5 weight% G - - - - 0.5 weight%

       Example Test Item 21 22 23 24 25 Coefficient of friction 0.18 or less 0.17 or less 0.17 or less 0.13 or less 0.12 or less Kinematic viscosity 7.7 7.7 7.8 7.8 7.9 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 200 or less 200 or less 200 or less 200 or less 200 or less Distillation range (℃) 350 or less 350 or less 350 or less 350 or less 350 or less Residue 2% less than 2% less than 2% less than 2% less than 2% less than

From the above Table 10, all the properties including the kinematic viscosity, acid value, flash point and residue characteristics even in the case of using the petroleum-based lubricating base oil (C) having a higher distillation range than the petroleum-based lubricating base oil (B) It can also be seen that it appears satisfactorily.

<Example 26-30>

Table 12 shows the results of evaluating the properties after preparing the metal co-coating agent having the composition shown in Table 11 below.                     

     Example composition 26 27 28 29 30 A - - - - - B - - - - - C 98 weight% 96 weight% 93 weight% 85 weight% 80 wt% D - - - - - E 2 weight% 4 weight% 4 weight% 10% by weight  10% by weight F - - 3 weight% 5% by weight 9.5 weight% G - - - - 0.5 weight%

       Example Test Item 26 27 28 29 30 Coefficient of friction 0.18 or less 0.17 or less 0.17 or less 0.13 or less 0.12 or less Kinematic viscosity 7.7 7.8 7.8 7.9 8.0 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 200 or less 200 or less 200 or less 200 or less 200 or less Distillation range (℃) 350 or less 350 or less 350 or less 350 or less 350 or less Residue 2% less than 2% less than 2% less than 2% less than 2% less than

It can be seen from Table 12 that the metal co-working agent of Example 26-30 exhibited satisfactory properties including the acid value, flash point, and residue properties even when a lubrication enhancer (E) having a higher kinematic viscosity than the ester-based lubrication enhancer (D) was used. Can be.

<Example 31-35>

To prepare a metal co-coating agent of the composition shown in Table 13 below, the results of the evaluation of the properties are shown in Table 14.                     

   Example composition 31 32 33 34 35 A 86 weight% 71 weight% 48 weight% 25% by weight 10% by weight B 10% by weight 25% by weight 48 weight% 71 weight% 86 weight% C - - - - D - - - - - E 4 weight% 4 weight% 4 weight% 4 weight% 4 weight% F - - - - - G - - - - -

       Example Test Item 31 32 33 34 35 Coefficient of friction 0.18 or less 0.18 or less 0.18 or less 0.18 or less 0.17 or less Kinematic viscosity 1.6 1.7 1.8 2.1 2.4 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 200 or less 200 or less 200 or less 200 or less 200 or less Distillation range (℃) 250 or less 270 or less 280 or less 300 or less 330 or less Residue Less than 1% Less than 1% Less than 1% Less than 1% Less than 1%

From Table 14, the metal co-working agents of Examples 31-35 are kinematic viscosity, acid value, flash point and residue characteristics by using two kinds of petroleum-based lubricant base oils (A and B) and ester-based lubricant improvers (E) having different distillation ranges. It can be seen that all the properties, such as appear satisfactorily.

<Example 36-40>

To prepare a metal co-coating agent of the composition shown in Table 15 below, the property evaluation results are shown in Table 16 below.                     

      Example composition 36 37 38 39 40 A - - - - - B 86 weight% 71 weight% 48 weight% 25% by weight 10% by weight C 10% by weight 25% by weight 48 weight% 71 weight% 86 weight% D - - - - - E 4 weight% 4 weight% 4 weight% 4 weight% 4 weight% F - - - - - G - - - - -

       Example Test Item 36 37 38 39 40 Coefficient of friction 0.17 or less 0.17 or less 0.17 or less 0.17 or less 0.17 or less Kinematic viscosity 2.8 4.5 6.2 7.1 7.5 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 120 or less 140 or less 150 or less 160 or less 200 or less Distillation range (℃) 330 or less 330 or less 350 or less 350 or less 350 or less Residue Less than 1% Less than 1% 2% less than 2% less than 2% less than

From the above Table 16, the metal co-working agent of Example 36-40 is characterized by kinematic viscosity, acid value, flash point and residue properties by using two kinds of petroleum-based lubricant base oils (B and C) and ester-based lubricant improvers (E) having different distillation ranges. It can be seen that all the properties, such as appear satisfactorily.

<Example 41-45>

To prepare a metal co-coating agent of the composition shown in Table 17 below is shown in Table 18 the characteristics evaluation results.                     

      Example composition 41 42 43 44 45 A 86 weight% 71 weight% 48 weight% 25% by weight 10% by weight B - - - - - C 10% by weight 25% by weight 48 weight% 71 weight% 86 weight% D - - - - - E 4 weight% 4 weight% 4 weight% 4 weight% 4 weight% F - - - - - G - - - - -

       Example Test Item 41 42 43 44 45 Coefficient of friction 0.18 or less 0.17 or less 0.17 or less 0.17 or less 0.17 or less Kinematic viscosity 1.6 2.6 5.8 6.8 7.2 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 80 or less 80 or less 90 or less 120 or less 200 or less Distillation range (℃) 260 or less 280 or less 280 or less 300 or less 350 or less Residue Less than 1% Less than 1% 2% less than 2% less than 2% less than

From the above Table 18, the metal co-working agent of Examples 41-45 is characterized by kinematic viscosity, acid value, flash point and residue properties by using two kinds of petroleum lubricant base oils (A and C) and ester lubricant improvers (E) having different distillation ranges. It can be seen that all the properties, such as appear satisfactorily.

<Example 46-50>

To prepare a metal co-coating agent of the composition shown in Table 19 below, the results of the property evaluation are shown in Table 20 below.                     

      Example composition 46 47 48 49 50 A 83 weight% 68 weight% 47 weight% 25% by weight 10% by weight B 10% by weight 25% by weight 46 weight% 68 weight% 83 weight% C - - - - D - - - - - E 4 weight% 4 weight% 4 weight% 4 weight% 4 weight% F 3 weight% 3 weight% 3 weight% 3 weight% 3 weight% G - - - - -

       Example Test Item 46 47 48 49 50 Coefficient of friction 0.17 or less 0.17 or less 0.17 or less 0.17 or less 0.17 or less Kinematic viscosity 1.7 1.8 1.9 2.1 2.5 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 200 or less 200 or less 200 or less 200 or less 200 or less Distillation range (℃) 250 or less 270 or less 280 or less 300 or less 330 or less Residue Less than 1% Less than 1% Less than 1% Less than 1% Less than 1%

From Table 20, the metal co-working agent of Example 46-50 was prepared by using two kinds of petroleum lubricant base oils (A and B) having different distillation ranges, an ester lubricant improver (E) and an alcohol lubricant lubricant (F). It can be seen that all properties are satisfactory, including kinematic viscosity, acid value, flash point and residue properties.

<Example 51-55>

To prepare a metal co-coating agent of the composition shown in Table 21 below, the results of the evaluation of the properties are shown in Table 22.                     

      Example composition 51 52 53 54 55 A - - - - - B 83 weight% 68 weight% 47 weight% 25% by weight 10% by weight C 10% by weight 25% by weight 46 weight% 68 weight% 83 weight% D - - - - - E 4 weight% 4 weight% 4 weight% 4 weight% 4 weight% F 3 weight% 3 weight% 3 weight% 3 weight% 3 weight% G - - - - -

       Example Test Item 51 52 53 54 55 Coefficient of friction 0.17 or less 0.17 or less 0.17 or less 0.17 or less 0.17 or less Kinematic viscosity 2.9 4.7 6.3 7.3 7.6 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 120 or less 140 or less 150 or less 160 or less 200 or less Distillation range (℃) 330 or less 330 or less 350 or less 350 or less 350 or less Residue Less than 1% Less than 1% 2% less than 2% less than 2% less than

From the above Table 22, the metal co-working agents of Examples 51-55 were prepared by using two kinds of petroleum lubricant base oils (B and C) having different distillation ranges, an ester lubricant improver (E) and an alcohol lubricant improver (F). It can be seen that all properties are satisfactory, including kinematic viscosity, acid value, flash point and residue properties.

<Example 56-60>

To prepare a metal co-coating agent of the composition shown in Table 23 after the property evaluation results are shown in Table 24 below.                     

      Example composition 56 57 58 59 60 A 83 weight% 68 weight% 47 weight% 25% by weight 10% by weight B - - - - - C 10% by weight 25% by weight 46 weight% 68 weight% 83 weight% D - - - - - E 4 weight% 4 weight% 4 weight% 4 weight% 4 weight% F 3 weight% 3 weight% 3 weight% 3 weight% 3 weight% G - - - - -

       Example Test Item 56 57 58 59 60 Coefficient of friction 0.18 or less 0.17 or less 0.17 or less 0.17 or less 0.17 or less Kinematic viscosity 1.6 2.7 5.8 6.9 7.3 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 80 or less 80 or less 90 or less 120 or less 200 or less Distillation range (℃) 260 or less 280 or less 280 or less 300 or less 350 or less Residue Less than 1% Less than 1% 2% less than 2% less than 2% less than

From Table 24, the metal co-working agents of Examples 56-60 were prepared by using two kinds of petroleum lubricant base oils (A and C) having different distillation ranges, an ester lubricant improver (E) and an alcohol lubricant improver (F). It can be seen that all properties are satisfactory, including kinematic viscosity, acid value, flash point and residue properties.

<Example 61-65>

To prepare a metal co-coating agent of the composition shown in Table 25 below, the results of the property evaluation are shown in Table 26 below.                     

      Example composition 61 62 63 64 65 A 70 weight% 55 weight% 40 weight% 25% by weight 10% by weight B 10% by weight 25% by weight 40 weight% 55 weight% 70 weight% C - - - - D - - - - - E  10% by weight  10% by weight  10% by weight  10% by weight  10% by weight F 9.5 weight% 9.5 weight% 9.5 weight% 9.5 weight% 9.5 weight% G 0.5 weight% 0.5 weight% 0.5 weight% 0.5 weight% 0.5 weight%

       Example Test Item 61 62 63 64 65 Coefficient of friction 0.13 or less 0.13 or less 0.13 or less 0.13 or less 0.13 or less Kinematic viscosity 1.9 1.9 2.1 2.4 2.6 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 200 or less 200 or less 200 or less 200 or less 200 or less Distillation range (℃) 250 or less 270 or less 280 or less 300 or less 330 or less Residue Less than 1% Less than 1% Less than 1% Less than 1% Less than 1%

According to Table 26, the metal co-working agents of Examples 61-65 are two kinds of petroleum lubricant base oils (A and B) having different distillation ranges, an ester lubricant improver (E) and an alcohol lubricant improver (F), and discoloration. By using the inhibitor (G) it can be seen that all properties, including kinematic viscosity, acid value, flash point and residue properties, are satisfactory.

<Example 66-70>

To prepare a metal co-coating agent of the composition shown in Table 27 below, the results of the evaluation of the properties are shown in Table 28.                     

    Example composition 66 67 68 69 70 A - - - - - B 70 weight% 55 weight% 40 weight% 25% by weight 10% by weight C 10% by weight 25% by weight 40 weight% 55 weight% 70 weight% D - - - - - E  10% by weight  10% by weight  10% by weight  10% by weight  10% by weight F 9.5 weight% 9.5 weight% 9.5 weight% 9.5 weight% 9.5 weight% G 0.5 weight% 0.5 weight% 0.5 weight% 0.5 weight% 0.5 weight%

       Example Test Item 66 67 68 69 70 Coefficient of friction 0.13 or less 0.13 or less 0.13 or less 0.13 or less 0.13 or less Kinematic viscosity 3.1 4.8 6.5 7.5 7.8 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 120 or less 140 or less 150 or less 160 or less 200 or less Distillation range (℃) 330 or less 330 or less 350 or less 350 or less 350 or less Residue Less than 1% Less than 1% 2% less than 2% less than 2% less than

According to Table 28, the metal co-working agents of Examples 66-70 are two kinds of petroleum lubricant base oils (B and C) having different distillation ranges, ester lubricant improvers (E) and alcohol lubricant improvers (F), and discoloration. By using the inhibitor (G) it can be seen that all properties, including kinematic viscosity, acid value, flash point and residue properties, are satisfactory.

<Example 71-75>

To prepare a metal co-coating agent of the composition shown in Table 29 below, the results of the evaluation of the properties are shown in Table 30.                     

    Example composition 71 72 73 74 75 A 70 weight% 55 weight% 40 weight% 25% by weight 10% by weight B - - - - - C 10% by weight 25% by weight 40 weight% 55 weight% 70 weight% D - - - - - E  10% by weight  10% by weight  10% by weight  10% by weight  10% by weight F 9.5 weight% 9.5 weight% 9.5 weight% 9.5 weight% 9.5 weight% G 0.5 weight% 0.5 weight% 0.5 weight% 0.5 weight% 0.5 weight%

       Example Test Item 71 72 73 74 75 Coefficient of friction 0.13 or less 0.13 or less 0.13 or less 0.13 or less 0.13 or less Kinematic viscosity 1.7 2.7 5.9 7.1 7.4 Computer 0.1 or less 0.1 or less 0.1 or less 0.1 or less 0.1 or less Flash point (℃) 80 or less 80 or less 90 or less 120 or less 200 or less Distillation range (℃) 260 or less 280 or less 280 or less 300 or less 350 or less Residue Less than 1% Less than 1% 2% less than 2% less than 2% less than

According to Table 29, the metal co-working agents of Examples 71-75 are two types of petroleum lubricant base oils (A and C) having different distillation ranges, an ester lubricant improver (E) and an alcohol lubricant improver (F), and discoloration. By using the inhibitor (G) it can be seen that all properties, including kinematic viscosity, acid value, flash point and residue properties, are satisfactory.

Comparative Example 1

The characteristics of Cindol 4625 (Howton, Korea), which is a metal co-coating agent mainly used in metal processing processes in which a washing process exists, are shown in Table 31 below.

 Cindol 4625 is composed of 70-80% by weight of lubricating base oil having a distillation range of 500 ° C. or less, 10-20% by weight of ester-based lubrication enhancer having less than 35 carbon atoms, 1-5% by weight of anti-coloring agent and antirust additive.                     

Comparative Example Characteristics Cindol 4625 Coefficient of friction 0.12 or less Kinematic viscosity 30.0 Computer 0.22 Flash point (℃) More than 180 Distillation range Less than 600 Residue 90% less than

According to the results of Table 31, it can be seen that the metal co-coating agent of Comparative Example 1 has a very poor residue properties of 90% or less, so that it is impossible to completely remove the residual oil only by the drying step, which omits the washing step.

<Comparative Example 2-5>

The properties of the lubricant base oil and the lubricant improving agent used in Comparative Example 2-5 are as follows.

Lubricant base oil

H: petroleum lubricant base oil with distillation range of 350-400 ° C, flash point of 200 ° C or more and kinematic viscosity (40 ° C, cSt) 10

I: Petroleum lubricant base oil with distillation range of 250-300 ℃, flash point of 200 ℃ or less, kinematic viscosity (40 ℃, cSt) 2.4

J: Petroleum lubricant base oil with distillation range of 150-200 ° C, flash point of 70 ° C or less, kinematic viscosity (40 ° C, cSt) 1.4

Lubrication Enhancer

K: ester compound having saponification value (mg KOH / g) of 300 or more and flash point of 300 ° C or more

L: ester compound having saponification value (mg KOH / g) of 200 or less and flash point of 300 ° C or less

A metal working emulsion was prepared in the composition as shown in Table 32 below, and the properties were evaluated in the same manner as in Example. The characteristics evaluation results are shown in Table 33.

      Comparative example composition 2 3 4 5 H 80 wt% - - 80 wt% I - 90 wt% - - J - - 90 weight% - K 20 wt% 10 wt% 10 wt% - L -  - -  20% by weight

       Comparative Example Test Items 2 3 4 5 Coefficient of friction 0.12 or less 0.12 0.12 or less 0.12 or less Kinematic viscosity 15 2.8 1.5 13 Computer 0.2 0.1 0.2 0.2 Flash point (℃) 220 or less 200 or less 70 or less 220 or less Distillation range (℃) 400 or less 350 or less 300 or less 400 or less Residue 95% 9% 9% 92%

As can be seen from the results of Table 33, the processing emulsion of Comparative Example 2-5 was good workability but poor drying properties generated excessive amounts of carbide 9 to 95% at high temperature (600 ℃) to hinder brazing .

<Comparative Example 6-11>

Comparative Example 6-11 below is an experimental example for the case where the content of the additive exceeds 20%.                     

     Comparative example composition 6 7 8 9 10 11 A 74 weight% - - 77 weight% - - B - 74 weight% - - 77 weight% - C - - 74 weight% - - 77 weight% D 10% by weight 10% by weight 10% by weight 15 weight%  15 weight% 15 weight% E 10% by weight 10% by weight 10% by weight 5% by weight 5% by weight 5% by weight F 5% by weight 5% by weight 5% by weight 2 weight% 2 weight% 2 wt% G 1 wt% 1 wt% 1 wt% 1 weight% 1 weight% 1 wt%

     Comparative example 6 7 8 9 10 11 Coefficient of friction 0.12 or less 0.12 or less 0.11 or less 0.12 or less 0.12 or less 0.11 or less Kinematic viscosity 1.8 3.0 8.0 1.9 3.0 8.1 Computer 0.2 or less 0.2 or less 0.2 or less 0.2 or less 0.2 or less 0.2 or less Flash point (℃) 80 or less 120 or less 200 or less 80 or less 120 or less 200 or less Distillation range (℃) 260 or less 330 or less 350 or less 260 or less 330 or less 350 or less Residue 3% less than 3% less than 3% less than 3% less than 3% less than 4% less than

The processing emulsions of Comparative Example 6-11 with an additive content of more than 20%, up to 23% and 26%, were of good workability, but during drying there were no locally dried additives on the surface of the plate, so that subsequent brazing An area where the plate was not welded occurred intermittently.

As described above, the processing oil according to the embodiment of the present invention uses a lubricant base oil and a lubricating enhancer that properly combines flash point, distillation range, and kinematic viscosity characteristics, so that the coefficient of friction, total value and residue characteristics of the processing oil compared to the processing oil of the comparative example. It can be seen that not only has sufficient lubricity but also excellent dryness, in particular, the residue property is 2% or less, since all of these properties are excellent. On the other hand, the processing oil of the comparative example using the lubricating base oil whose flash point, distillation range and kinematic viscosity characteristics are out of the scope of the present invention reaches 90% of residue properties, so it is impossible to remove residual oil by drying instead of washing. have.

<Application example>

Hereinafter, one example of a process for producing an evaporator core using the metal working emulsion according to the present invention has been described in detail, but it can be widely applied to the manufacture of a heat exchanger requiring a washing process such as a heater core.

The method of producing the evaporator core includes a vacuum brazing method using a vacuum furnace and a flux brazing method of applying a flux to a product surface and then brazing the product. Conventional processes for producing products in these ways are as shown in FIGS. 1 and 2, respectively.

That is, in the case of vacuum brazing or flux brazing, as shown in FIGS. 1 and 2, after the plate pressing and core forming steps, a single washing process for removing the processing oil must be essentially performed.

The cleaning process, also known as degreasing, is usually a complex process such as prewashing ⇒ first wash ⇒ second wash ⇒ rinse ⇒ blow off.

In the case of vacuum brazing, a non-aqueous organic solvent is mainly used for the washing process, and in the case of flux brazing, an aqueous washing method is used. Either way, there is a lot of capital investment, and there are a lot of environmental problems including the working costs and the working environment caused by the generation of organic solvent waste liquid and waste water.                     

Thus, the processing oil developed by the present inventors can be removed after the press and pin mill process because the process oil is vaporizable removable by hot air. Therefore, when the processing emulsion according to the present invention is applied, the washing process can be omitted, and the vacuum brazing or the flux brazing process can be simplified as shown in FIGS. 3 and 4.

In the current metal processing field, the washing process is carried out to remove the residual oil after processing the material. In the case of using the metal working oil according to the invention, the oil residue is excellent in drying and lubrication, so it is possible to remove the oil residue by the drying process without the washing process. It can reduce the capital investment cost, reduce the wastewater treatment cost, improve the working environment and reduce the environmental problems caused by the wastewater generation, and the efficient management by applying the fast-drying oil to the pin mill and press process.

Claims (11)

At least one lubricant base oil having a flash point of 50 to 200 ° C., a distillation range of 150 to 350 ° C. and a kinematic viscosity (40 ° C., cSt) of 1 to 8, and at least one member selected from the group consisting of esters, alcohols and hydrocarbons. A metal co-working agent comprising a lubrication enhancer. According to claim 1, wherein the amount of the lubricant improver, the metal-coating agent, characterized in that 20% by weight or less based on the total weight. The metal co-sharing agent according to claim 1, wherein the lubricant base oil is at least one selected from the group consisting of petroleum oil, mineral oil oil and synthetic oil. According to claim 1, The lubricating base oil is a metal co-coating agent, characterized in that the petroleum base oil having a distillation range of 250 ℃ or less, petroleum base oil having a distillation range of 350 ℃ or less or a mixture thereof. The method of claim 1, wherein the ester-based lubrication improver is one or more selected from the group consisting of vegetable, animal and synthetic esters, carbon number 11-60, acid value (mg KOH / g) 2.0 or less, saponification value (mg KOH / g ) 50 to 300 and a flash point of 300 ° C. or less, characterized in that the metal co-coating agent. The method of claim 5, wherein the ester-based lubrication improver is a metal co-sharing agent, characterized in that represented by the general formula: RCOOR ' Wherein R is an alkyl substituent having 10 to 30 carbon atoms, and R 'is an alkyl substituent having 1 to 30 carbon atoms. According to claim 2, wherein the alcohol-based lubricant is at least one selected from the group consisting of alcohols and synthetic alcohols extracted from vegetable and animal fats and oils, containing an alkyl substituent of 10 to 24 carbon atoms, the acid value (mg KOH / g ) 1.0 or less, saponification value (mg KOH / g) 5 or less, flash point (° C) 300 or less, characterized in that the metal co-coating agent. The metal-based co-sharing agent according to claim 2, wherein the hydrocarbon-based lubricant improving agent is at least one selected from the group consisting of mineral oil-based hydrocarbons and synthetic hydrocarbons obtained by refining petroleum. In the metal processing method comprising the step of forming a metal material by cutting, grinding or plastic processing to have a predetermined shape, wherein the metal co-coating agent of any one of claims 1 to 8 in the forming step , The metal processing method, characterized in that the emulsion remaining on the metal surface after the forming process is removed only by the drying process without a separate washing process. a) forming a part for a heat exchanger using the metal-coating agent of any one of claims 1 to 8; b) drying the heat exchanger parts; c) stacking the heat exchanger parts to assemble a heat exchanger core; And d) brazing the heat exchanger core, wherein the cleaning step is not performed after the component forming step for the heat exchanger. 11. The method of claim 10, further comprising the step of applying a flux after drying the components for the heat exchanger prepared in step a) prior to the b) drying step, wherein the washing step is not performed before applying the flux. Heat exchanger core manufacturing method characterized in that.

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